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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>

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<!-- 方式一 -->
<!-- <script>
    function fn(obj) {
        var obj2 = Array.isArray(obj) ? [] : {}
        for (var key in obj) {
            if (typeof obj[key] == 'object') {
                obj2[key] = fn(obj[key])
            } else {
                obj2[key] = obj[key]
            }
        }
        return obj2

    } 
    var obj = { name: '张三', age: '18' ,xinqu:['stings']}
    var obj2 = fn(obj)
    console.log(obj,obj2);
    obj.xinqu.push('wang')
    console.log(obj,obj2);

</script> -->



<!-- 方式二 -->
<!-- <script>
    function fn(obj){
        var obj2 = JSON.parse(JSON.stringify(obj))
        return obj2
    }
    var obj = { name: '张三', age: '18' ,xinqu:['stings']}
    var obj2 =fn(obj)
    console.log(obj,obj2);
    obj.xinqu.push('zhangsan')
    console.log(obj,obj2);
</script> -->



<!-- 方式三 -->
<!-- <script>
    var obj ={ name: '张三', age: '18' ,xinqu:['stings']}
    var obj2 = Object.assign({},obj)
    console.log(obj,obj2)
    // obj.xinqu.push('wang')
    obj.name='李四'
    console.log(obj,obj2);
</script> -->